Stainless Steel Discaloy-HR vs Discaloy ST-SA
Stainless Steel · Discaloy temper comparison
Discaloy-HR and Discaloy ST-SA are two conditions of the same stainless steel grade, Discaloy: HR (hot rolled) versus ST-SA (ST + single age). The chemistry is identical, so every difference below comes from the condition. Discaloy ST-SA is the stronger of the two: yield strength 660 MPa (95.7 ksi) against 450 MPa (65.3 ksi) for Discaloy-HR, about 47% more; tensile strength follows at 940 MPa (136 ksi) vs 800 MPa (116 ksi). In exchange, Discaloy-HR is the more ductile: elongation 30% versus 23% for Discaloy ST-SA, and Discaloy ST-SA is harder (270 HB vs 230 HB). On the shop floor, Discaloy-HR machines more easily (30 vs 20 out of 100) and Discaloy-HR welds better (good vs fair).
Discaloy-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
Discaloy ST-SAChoose it when strength drives the design.
Discaloy-HR vs Discaloy ST-SA: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 196 GPa28.4 Msi · Shear Modulus 76 GPa11 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.97 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,380°C2,516 °F · Liquidus Temperature 1,430°C2,606 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 15.5 µm/m·K8.6 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.9 % IACS · Electrical Resistivity 9.1×10⁻⁷ Ω·m35.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 62 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 190 L/kg22.8 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Discaloy-HR vs Discaloy ST-SA — frequently asked
Is Discaloy ST-SA stronger than Discaloy-HR?
Yes. Discaloy ST-SA has a typical yield strength of 660 MPa (95.7 ksi) against 450 MPa (65.3 ksi) for Discaloy-HR — about 47% more. Tensile strength is 940 MPa (136 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, HR or ST-SA?
STA is the default Discaloy condition in the FabDigit quote flow (neither HR nor ST-SA). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, Discaloy-HR or Discaloy ST-SA?
Discaloy-HR, by a small margin. Both rate poor for machinability — 30/100 against 20/100 for Discaloy ST-SA; for welding the order is Discaloy-HR first (good, 55/100) then Discaloy ST-SA (fair, 42/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Discaloy-HR and Discaloy ST-SA side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.